Palladium-Catalyzed Direct Arylation of 4-Chromanones: Selective Synthesis of Racemic Isoflavanones and 3,3-Diaryl-4-chromanones
作者:Fabio Bellina、Tiziana Masini、Renzo Rossi
DOI:10.1002/ejoc.200901356
日期:2010.3
yields and with high selectivity by Pd-catalyzed direct C-3 arylation of 3-unsubstituted 4-chromanones with aryl bromides with the aid of a Pd 2 (dba) 3 /tBu 3 PHBF 4 catalyst system in the presence of KHCO 3 as the base in a dioxane/water mixture (4:1). This catalyst system has also been employed in an unprecedented synthesis of 3,3-diaryl-4-chromanones through directarylation of 4-chromanones in